/Engine/Source/Editor/MovieSceneTools/Public/Constraints/TransformConstraintChannelInterface.h
Add keys on the transform channels of the the object that the handle wraps.
void AddHandleTransformKeys ( const [TSharedPtr](API\Runtime\Core\Templates\TSharedPtr)< [ISequencer](API\Editor\Sequencer\ISequencer) > & InSequencer, const [UTransformableHandle](API\Runtime\Constraints\UTransformableHandle) * InHandle, const [TArray](API\Runtime\Core\Containers\TArray)< [FFrameNumber](API\Runtime\Core\Misc\FFrameNumber) > & InFrames, const [TArray](API\Runtime\Core\Containers\TArray)< FTransform > & InLocalTransforms, const EMovieSceneTransformChannel & InChannels )